Sounds like you want a nested DataObjectManager?

http://www.leftandmain.com/silverstripe-screencasts/2010/08/23/nested-dataobjectmanager-a-dom-in-a-dom/

--------------------
SilverStripe tips, tutorials, screencasts and more: http://www.leftandmain.com

The code is right?

<?php
class Fabricante extends DataObject {
static $db = array(
'Nomefab' => 'Varchar(255)',
);

static $has_many = array(
      'Produtos'=>'Produto'
);

static $searchable_fields = array(
'Nomefab'
);

static $summary_fields = array(
'Nomefab' => 'Nome Fabricante'
);

function getCMSFields(){

   return new FieldSet(
   
   new TextField('Nomefab','Nome Fabricante')

   );
   
       $managerpro = new ManyManyComplexTableField(
       $this,
       'Produtos',
       'Produto',
       array('Nome'=>'Nome'),
       'getCMSFields_forPopup' );
   
    //$f->removeFieldFromTab('Root', 'Fabricantes'); //
    $f->addFieldToTab('Root.Fabricantes', $managerpro);

}

}
?>

yes... that's worked!!
wonderful.... but i have other problem... in myCrm...

the interface appears unconfigured and dataobject gives errors... not save for example....